Add .gitattributes to enforce line endings

More info: https://docs.github.com/en/get-started/getting-started-with-git/configuring-git-to-handle-line-endings

.gitattributes

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+# Set the default behavior, in case people don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files you want to always be normalized and converted
+# to native line endings on checkout.
+*.bash text eol=lf
+*.bat text eol=lf
+*.cmd text eol=lf
+*.css text eol=lf
+*.scss text eol=lf
+*.dist text eol=lf
+.editorconfig text eol=lf
+.env* text eol=lf
+.gitignore text eol=lf
+.htaccess text eol=lf
+*.htm text eol=lf
+*.html text eol=lf
+*.ini text eol=lf
+*.js text eol=lf
+*.json text eol=lf
+*.lock text eol=lf
+*.md text eol=lf
+*.php text eol=lf
+*.php_cs text eol=lf
+*.php8 text eol=lf
+*.plex text eol=lf
+*.sh text eol=lf
+*.svg text eol=lf
+*.ts text eol=lf
+*.twig text eol=lf
+*.txt text eol=lf
+*.xml text eol=lf
+*.xsd text eol=lf
+*.yaml text eol=lf
+*.yml text eol=lf
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpeg binary
+*.jpg binary
+*.gif binary
+*.ico binary
+*.pdf binary
+*.swf binary
+*.zip binary
+*.ttf binary
+*.woff binary
+*.woff2 binary